I wasn't suggesting you should have to zone although I know it was suggested so I'm not saying you're putting words in my mouth. Doubling back is a non-issue because you have 3 utsusemi shadows, 2 of which may be taken and you will normally outrange -gas.
The circular route is the more logical I agree, but I don't like the detectors; an extra factor which involves an extra attention cycle and is potentially an extra area for a problem to occur.
I know it is a tired point, but so is doubling back on yourself. Neither hampers your solo ability at each area.
If one had to RELY on zoning out, I would agree with you. As it is, I really don't think the difference is much beyond preference.
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